baffle plate
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What is the relationship between the pore size of the baffle plates and the heat exchange tubes? What should be the hole diameter of the baffle for a heat exchange tube with an OD of 19.05?
The drilling diameter is d+0.40, with a tolerance of +0.3
19.05 – why such precision, what’s it used for?
The outer diameter of the heat exchange tube is 19.05 – that’s too precise
It is also necessary to know that when the maximum unsupported span of the heat exchange tubes is d≤32 and Lmax＞900, the diameter of the tube holes is d+0.4, with an allowable deviation of 0~+0.3; when d＞32 and Lmax≤900, the diameter of the tube holes is d+0.7, with an allowable deviation of 0~+0.3
GB/T 151-2014 for heat exchangers provides detailed specifications, including the tolerances for heat exchange tubes as well as those for the tube holes in the tube sheet; these tolerances vary depending on the material used. (I want to upload a screenshot, but it keeps failing to upload.)
British standard heat exchange tubes, 3/4", with British standard holes in the baffle as well
The pore size of the baffle tubes must be strictly controlled; otherwise, both the baffling and supporting effects will be affected
Are exchangers with baffle plates generally fixed-tube-sheet tube-sheet exchangers?
All types of heat exchangers, such as U-tube, floating-head, and threaded lock ring types, are equipped with baffle plates; it can be said that essentially all shell-and-tube heat exchangers have baffle plates, which not only enhance heat transfer but also serve to support the heat exchange tubes.